Is ostensibly about an intriguing new technology, muon imaging, that may enable clean up crews to peer into the reactor buildings. But the most important part of the story comes in the first two paragraphs:

Nobody really knows, because nobody has yet examined many of the most important parts of the wreckage. Though three and a half years have passed, it is still too dangerous to climb inside for a look, and sending in a camera would risk more leaks.

This has been the first point I make when people ask me about Fukushima: nobody has looked at the problem yet. Imagine if you had a massive leak in the pipes of your house. Your first goal might be to switch off the main water supply, and remove excess water. But if, after 3 years nobody had taken a look at the damage caused or the cause of the leak, where would that leave you? To clean something up, you need to look at it first. No one has done that, and until they do, we can say that there is currently no (credible) plan to clean up Fukushima.

The other article shows the failure of the "Frozen Wall" plan...a dubious plan from the start in my mind.